Method and apparatus for manipulating image data employing an intermediate format
US5095512A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1988 |
| Grant date | Mar 10, 1992 |
| Priority date | — |
| Expiry date | Oct 24, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/413
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Bit-mapped and compressed image data are converted one another through an intermediate image data or code form wherein each image is represented by a list of sublists, each sublist being itself a list of numerical values representing run lengths transistions from one type of picture element (pel) to a second and opposite type of picture element (pel) (e.g., a black pel and a white pel). Hence the intermediate code data structure according to the invention is termed a transition list or TL code or data structure. The data structure and coding rules are defined by rules relating to code type, code word length and code word interdependence. A specific conversion process specifies that the transition list be composed of sublists wherein each represents a scan line. The preferred form of intermediate code is a fixed word-length transition list, that is, a serial list of values representing run lengths of either "black" picture elements or "white" picture elements stored serially in digital data format having a fixed word length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.